On 1/29/05 8:48 AM, "Amy Chin-Atkins" <[log in to unmask]> wrote:
> Hi Jodine, Lynn,
>
> I've noticed anecdotally that women whose menses returned quickly after
> childbirth often had a history of heavy, irregular and painful menses, with
> one of the women diagnosed as having endometriosis. Has anyone seen research
> on this?
I haven't. FWIW, I have a history of light, regular menses, although I do
have short - 24 day - cycles. Another lactnetter sent me some research on
estradiol levels offlist:
http://humrep.oupjournals.org/cgi/content/full/16/12/2540
Plasma prolactin/oestradiol ratio at 38 weeks gestation predicts the
duration of lactational amenorrhoea
Carmen Campino1, Claudia Torres5, Alonso Rioseco2, Andrés Poblete2, Edda
Pugin4, Verónica Valdés3, Silvia Catalán3, Cristián Belmar2 and María
Serón-Ferré5,6
1 Departments of 1Endocrinología, 2 Obstetricia y Ginecología, 3 Pediatría,
4 Centro de Lactancia, Facultad de Medicina and 5 Department of Ciencias
Fisiológicas, Facultad de Ciencias Biológicas, Pontificia Universidad
Católica de Chile, Santiago, Chile
BACKGROUND: Fully breastfeeding women experience an amenorrhoea of variable
duration. Our aim was to identify in pregnancy, endocrine markers that could
predict the duration of subsequent lactational amenorrhoea. METHODS: We
studied 17 healthy women at 34 and 38 weeks gestation, and 1 and 3 months
post-partum. The women fully breastfed until 6 months post-partum. During
pregnancy, prolactin (PRL), oestrogens (total oestradiol, unconjugated
oestrone, unconjugated oestriol), sex hormone binding globulin (SHBG),
dehydroepiandrosterone sulphate (DHEA-S), progesterone and placental
lactogen, and during post-partum PRL, oestrogens and SHBG, were measured.
Free oestradiol in pregnancy and post-partum was calculated. RESULTS: Ten
women experienced long (>6 months) and seven experienced short (<6 months)
lactational amenorrhoea. At 38 weeks gestation, the women who experienced a
long lactational amenorrhoea had twice as much PRL, about half the total
oestradiol, lower SHBG concentration (P < 0.05, Student's t-test, Bonferroni
modification) and similar free oestradiol concentration, compared with those
who experienced short lactational amenorrhoea. The difference in PRL
concentration persisted in post-partum postsuckling samples. CONCLUSION: At
38 weeks gestation, the ratio PRL/oestradiol identified all individual women
according to the subsequent duration of their lactational amenorrhoea,
suggesting that duration of lactational amenorrhoea is conditioned during
pregnancy.
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